Silver has a density of 0.04 lb/cm^3. A standard silver bar has a volume of 642

The weight of the mentioned silver bar is:

Step-by-step explanation:

Remember that the formula of density is:

From this formula, you can clear the mass (because this is the valor you need to solve the exercise), so you will have:

With this last formula, you must replace the values given in the exercise:

You can check this value using the original formula of density and see if the density has the same valor of the exercise:

A

Step-by-step explanation:

The two equations rapresents two lines who have the same slope and so they are parallel